Micrometer calipers



G. COUSINS,

M|cRoMETER- CALIPEHS. l APPLICATION FILED APR. 26,1920.

1,405,295. l Patented 1311.31, 1922.

3 SHEETS-SHEET I.

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A TTOHNE V8 G. COUSINS.

NHCROMETER CALIPERS.

APPLICATION FILED APR. 26. |920.

1 ,405,295,v l v Patented Jan. 31, 1922.

3 SHEETS-SHEET 2.

A TTOH/VEYS y Geor eCouSm @w MW G. COUSINS.

MICHOMETER CALIPERS.

APPLICATION FILED APR.26. 1920.

Patented J 21111.31, 1922.

3 SHEETS-SHEET 3.

Geore Coums.

Br Z

ATTORNEYS UNiTED GEORGE coUsINs, or oswnoo, NEW YORK."

MICROMETER CALIF-ERS.

Specification-of Letters Patent.

Application med April 26, 1920. serial Nb. 376,742;

My present invention relates generally to micrometer calipers and more particularly Y to micrometer calipersof thetype described and claimed in my co-pending-.application Serial No. 343,738, filed December 19, 1919, and in connection with which application it is the object of my present invention to provide certainjimprovernents relating in part to the .adjustment or relocation of the -caliper legs especially in instances of Work requiring change of position with celerity and precision, as Well asin part to avoidance of breakage in the hands of 'unskilled persons and also in part to the provision'formore minute measurements.

In the accompanying drawings which illustrate my present'inventi'on and form -a part of this speeiiication, y

f Figure 1 is a front elevation showing my improvements complete,

. Figure 2 is a detail side view of the podger removed,

Figure 3 1s a detail longitudinal .A section 'through the adjusting screw and the adjacent end of the adjusting leg,

Figure 4 is, a detail vertical section taken on line 4 4 of Figure 1,

Figure 5 is a side view of the device complete with the adjusting leg clamped,

Figure 6 is a side view partly broken away and in section lshowing the adjusting leg re-` leased for adjusting movement,

Figure 7 is a side view looking at the opposite side with respect-to Figures 5 and 6. Figure 8 is a side view of a modified form, and f I 'Figures'Q and 10 are end views, looking at the opposite' ends ofFigure'8'.,

Referring now to Figuresl to 7- inclusive the caliper bar10 of my improved device is received within the tubular inner ,ends v11 and 12 of the two caliper legs 13 and 14, the former of which is a stationary leg,V though removable from the bar 10, and the latter of which is the adjustable leg. Y

At one side, and extendingsomewhatless` than half of its circumference, the bar 10 has a toothed surface 15, its teeth being orrlcsg*- Eatented` J an. 31,"1922r Y either in the nature of Vthreads'o'r aA rack, i

for cooperation with the similarly shaped inner surfacef'of one side 16 of each of the lengthwise split leg ends 11 and 12, theop posite sides of which have inner V-shaped recesses 17 ,Which cooperate with the simi-v larly beveled side face of the bar 10 dia-V metrically opposite its toothed surface 1 5, as plalnly seen in Figures 5, 6 and 7 It `will be understood that the bar 10 has its toothed surface vand beveled facesextendingfor its 4 Y full length and providing for similarengagement therewith by both of theA caliper legs 13 and 14, the inner split bearngvpor'- tions of which have vears 18,'in ,connection with which clamping screws 19 and20op-f -1 crate. The screw 19 of leg 13, as bes-t seen in Figure 7, has a shoulder abutting one side portion and threads screwing yinto the other side portion and is manipulated by a knobA 21 whosek shank may have. a diametrical opening 22fforxwhichthew podg'er 23 of Figure 2 isprovided.v #This podgerhas a handle 24 andathreaded portion 25 and is normally housed in an axial' bore of the bar Y v1() at one end, within a counter-boreof which the threads 25 engage to hold the podger between its'periodsj of use.

VThe screw 20- of the leg A.14e-gas seen in Figures 5 and G'has threads screwing into one ofthe ears 18 and has a vknob 26 and an apertured shank27, the latter of whichis providedwith a collar` -28 rotatable in a re-` cess lof a -supplemental piecev29 attached .to the other earf so that the two sides willjbe spread or-contracted `in order to quickly f ree the leg 14 for adjustment the bar 10.

. It is obvious that the two legs beingthus similarly secured, can in usegbe quickly' and lengthwise along accurately brought into the desired relation,

the toothed surface 15 ofthe bar providingA for their relocation at the desireddistance while the inclined or beveled faces and the cooperating V-'shaped recesses 17 will:v instantly' bringthe legs into the same `plane ,g

when the adjustable leg iSv-clamped by the screw 20. l f f' The outer ends of. the legs 13 and. 14 have split-tubularl portions 30V and 31, lthe former Vbeing internally threaded for the,

receptionV of an adjustable anvil 32 which may have the various shapes shownfin ,fullf and dotted lines in Figure 1 for `dierentI uses in connection with plain surfaces, openings, and threads, the said split tubularvends 30 having ears 33 by which it is normally clamped through the useof the clamping screw 34 like the screw 19.

The split tubular end 30 of the adjustable leg 14 is internally threaded to receive anV yand 34, and as seen particularly in Figure 3 the adjustable screw 35 is providedV with an enlarged bore extending` therein from one end to receive a spring 41 compressed by means of a screw plug 42 threaded into the outer end of the bore, againstthe inner head 43 of a feeling pin 44, the latter of which extends from the head 43 through an axial opening of the adjustable screw and projects to a point beyond one end of the same so as to come in contact with the work. By means of this arrangement vcareless application of the tool to work of greater diameter than that to which the tool is set, which frequently happens in the course of its usey in unskilled hands, l provide against disastrous consequences in'so far'as breaking or straining the caliper legs is concerned' by virtue of the yielding qualities of the feeling pin 44 against the tension vof spring 41 which serves to normally hold it inthe proper position. For ex# ample, an amateur mechanic frequently attempts to caliper work revolving in a lathe,

vsomething which can be done with the ordinary spring calipers. With the usual rigid micrometer caliper however, the work, if a triie larger than the caliper space, will seize the caliper and very often crack or break the same in its rotation with the work. rlhe feeling pin l propose avoids such a seizure on account of its yielding capabilities.

The bar 10 is'of course to be calibrated so that the measurement is read partially `therefrom and partially from the calibrations end of the adjustable screw 35, the screw plug passing through a central opening in the disk which latter is calibrated around its edge as clearly seen in Figure 5. With this disk a pointer in the nature of an arm 46 cooperates, one end of this arm being pivotally connected by a screw 47 to the adjustable leg 14 intermediate the ends of the latter so that it may be swung outwardly to the effective position shown in full lines in Figure 1 for cooperation with the disk 45, or inwardly lengthwise of the adjustable leg 14 in order that it may be protected while it isnot in use. To cooperate with the screw 47, the podger 23 may terminate in a screw driver end 48.

It is obvious that the measuring ends or work engaging ends of the anvil 32 and adjusting screw 35 may be variously shaped as usual dependent upon the particular work to be calipered, and it is obvious that both of the legs 13 and 14 may be reversed so as to caliper openings, or the anvil 32 and adjustable screw 35 reversed at their outer ends for this purpose. It is obvious furthermore that if the caliper legs are reversed, the-bar 10 with its particular shape as described will continue to cooperate with the bar engaging ends of the legs for the purpose of insuring accurate positions of the legs at all times.

ln Figures 8, 9 and 10, l have shown a modified construction wherein an adjustable anvil 50 works through, and is clamped within, one split tubular end or leg 51 of a solid rigid U-frame 52, in a manner similar to that in whichV the bar l() is held in connection with the adjustable leg 14 in the first form. rThe opposite end or leg of the frame 52 is of tubular form/ at 53 and is split and apertured to receive an adjustable screw 54 like the formerly described adjustable screw 35, provided with a calipered disk 55 which in lthis instance cooperates with an indicating arm 56 pivoted upon the frame 52. This modification illustrates plainly theV adaptability of the invention in certain respects to a micrometer caliper of the usual form.

I have also shown in Figure 1 dotted lines indicating a stand or holder engageable with the caliper bar-when the latter is used as a bench caliper'.V

I claim:

' 1. A micrometer caliper comprising a bar, a pair of caliper legs having gaging means at their outer ends and having split tubular inner ends, and clamping screws for the split tubular ends on the bar, said bar having a toothed surface extending partially therearound and lengthwise thereof and having an angular surface extending therealong opposite the toothed portion, and said tubular portions of said legs having their sides formed to cooperate with the toothed and beveled portions of the bar whereby to insure co-planar positions of the legs in xed spaced relation.

2. A micrometer caliper comprising a bar having a transversely toothed longitudinal surface at one side and a lengthwise extending angular tace opposite the toothed surface, and caliper legs having gaging means at theil` outer ends and having split tubular inner ends embracing the bar and provided with clamping means, the opposite side portions of said tubular ends being internally formed to cooperate with the toothed surface of the bar and its beveled face whereby to insure fixedly spaced and co-planar positions of the legs when clamped to the bar.

3. A micrometer caliper comprising a bar having a longitudinal face .at one side of its axis provided with transverse teeth and having beveled faces at the relatively opposite side of its axis and extending lengthwise therealong, and caliper legs having gaging means at their outer ends and having split tubular inner ends embracing the bar and provided with clamping means, one side portion of each of the said tubular ends being toothed to cooperate with the toothed surface of the bar and the other side portion of each tubular end having a recess with fiat walls tol cooperate with the beveled faces of the bar, as and for the purpose set forth.

4. A micrometer caliper including a bar, a leg adjustable on the bar, an anvil, and an adjustable screw carried by the leg and opposing the anvil, and a spring controlled feeling pin carried by the adjustable screw and projecting beyond the inner end of said screw.

5. A micrometer caliper including a bar, a leg adjustable on the bar, an anvil, and an adjustable screw carried by the leg and opposing the anvil, said adjustable screw having a bore extending inwardly from one end and an axial opening projecting through its opposite end and in communication with the bore, a feeling pin extending through the said opening .and having a head in the bore, and a spring compressed in the bore and engaging the head to hold the feeling pin in propel` position.

6. A micrometer caliper including a bar, a leg adjustable on the bar, an anvil, and an adjustable screw carried by the leg and opposing the anvil, said adjustable screw having a bore extending inwardly from one end and an axial opening projecting through its opposite end and in communication with the bore, a feeling pin extending through the said opening and having a head in the bore, a screw plug threaded into the outer end of the bore,and a spring in the bore compressed between the said plug andthe Y vhead of the feeling pin.

7. A micrometer caliper comprising a frame including a pair of caliper legs, an anvil supported'by one of the legs, an .ad-

justable screw carried by the other leg andl opposing the anvil, a measuring disk tx'ed to one end of the said adjustable screw, and a pointer carried by the respective leg yand cooperating with the said measuring disk, said pointer being lin the nature of an arm pivotally connected to the leg intermediate the ends of the latter and movable between positions parallel with and at right angles 

